"""Dark engineering control-room theme for Murphy Unified dashboard.

Provides CSS, JS, colour constants, Plotly template, and helper functions
shared by every tab.
"""

from __future__ import annotations

import plotly.graph_objects as go
import plotly.io as pio

# ── Colour palette ──────────────────────────────────────────────────────────
BG = "#1a1e24"
SURFACE = "#21262e"
SURFACE2 = "#272d37"
BORDER = "#333c48"
BORDER_BRIGHT = "#445060"
ACCENT = "#4a9eca"
ACCENT2 = "#4fc98a"
WARN = "#d4922a"
DANGER = "#c94a4a"
TEXT = "#b8c8d8"
TEXT_DIM = "#6a7e92"
TEXT_BRIGHT = "#d8e8f0"

TRACE_COLORS: list[str] = [ACCENT, ACCENT2, WARN, DANGER, "#7a8fca", "#ca7a9e"]

# ── Named semantic colors for tab-level use (avoid hardcoded hex in tabs) ──
ENERGY_POS = ACCENT2       # positive energy terms in bar charts
ENERGY_NEG = DANGER        # negative energy terms
VALVE_ICV = ACCENT         # ICV traces
VALVE_DCV = DANGER         # DCV traces

# ── Google Fonts ────────────────────────────────────────────────────────────
FONTS_HTML = (
    '<link rel="stylesheet" href="https://fonts.googleapis.com/css2?'
    "family=JetBrains+Mono:wght@400;500;600&"
    'family=DM+Sans:wght@400;500;600;700&display=swap">'
)

# ── CSS ─────────────────────────────────────────────────────────────────────
CSS = """
/* ── Murphy Unified — dark engineering theme ─────────────────────────── */
:root {
    --bg: #1a1e24; --surface: #21262e; --surface2: #272d37;
    --border: #333c48; --border-bright: #445060;
    --accent: #4a9eca; --accent2: #4fc98a; --warn: #d4922a; --danger: #c94a4a;
    --text: #b8c8d8; --text-dim: #6a7e92; --text-bright: #d8e8f0;
    --mono: 'JetBrains Mono', monospace;
    --body: 'DM Sans', sans-serif;
}

/* ── Plotly modebar — always visible on hover (issue #13) ──────────── */
.js-plotly-plot .modebar { opacity: 0.7 !important; }
.js-plotly-plot:hover .modebar { opacity: 1 !important; }
.js-plotly-plot .modebar-btn { font-size: 16px; }

/* ── body / dark-mode override ──────────────────────────────────────── */
body, .dark {
    background: var(--bg) !important;
    color: var(--text) !important;
    font-family: var(--body) !important;
}
.gradio-container {
    background: var(--bg) !important;
    max-width: 100% !important;
}
.block, .gr-block, .gr-box, .gr-panel {
    background: var(--surface) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
}
input, textarea, select, .gr-input, .gr-text-input {
    background: var(--surface2) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
    font-family: var(--mono) !important;
}
button, .gr-button {
    background: var(--surface2) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
    font-family: var(--body) !important;
}
button.primary, .gr-button.primary {
    background: var(--accent) !important;
    color: var(--bg) !important;
    border-color: var(--accent) !important;
}

/* ── Tab navigation ─────────────────────────────────────────────────── */
.tabs .tab-nav button, .tab-nav button {
    font-family: var(--mono) !important;
    font-size: 10px !important;
    text-transform: uppercase !important;
    letter-spacing: 2px !important;
    color: var(--text-dim) !important;
    background: var(--surface) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
    padding: 8px 16px !important;
}
.tabs .tab-nav button.selected, .tab-nav button.selected {
    background: var(--surface2) !important;
    color: var(--accent) !important;
    border-color: var(--border-bright) !important;
    border-bottom: 2px solid var(--accent) !important;
}

/* ── Headings ───────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--body) !important;
    font-weight: 700 !important;
    text-transform: uppercase !important;
    letter-spacing: 2px !important;
    color: var(--text-dim) !important;
}

/* ── Tables ──────────────────────────────────────────────────────────── */
table {
    background: var(--surface) !important;
    border-collapse: collapse !important;
}
thead, th {
    background: var(--surface2) !important;
    font-family: var(--body) !important;
    font-weight: 600 !important;
    text-transform: uppercase !important;
    color: var(--text-dim) !important;
    border: 1px solid var(--border) !important;
}
td {
    background: var(--surface) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    font-family: var(--mono) !important;
    font-size: 12px !important;
}

/* ── Accordion ──────────────────────────────────────────────────────── */
.gr-accordion .label-wrap, .accordion .label-wrap {
    font-family: var(--body) !important;
    font-weight: 600 !important;
    text-transform: uppercase !important;
    letter-spacing: 2px !important;
    color: var(--text-dim) !important;
}

/* ── Sliders ────────────────────────────────────────────────────────── */
.gr-slider label, label span {
    font-family: var(--body) !important;
    color: var(--text-dim) !important;
}

/* ── Dropdown / listbox ─────────────────────────────────────────────── */
.gr-dropdown, .gr-listbox, ul.options {
    background: var(--surface2) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
    border-radius: 4px !important;
}
.gr-dropdown li:hover, .gr-listbox li:hover, ul.options li:hover {
    background: var(--surface) !important;
}

/* ── Footer hidden ──────────────────────────────────────────────────── */
footer { display: none !important; }

/* ── Metric cards (LEFT accent bar) ─────────────────────────────────── */
.metric-row {
    display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0;
}
.metric-card {
    flex: 1; min-width: 140px;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: 4px;
    padding: 8px 12px;
}
.metric-card.green  { border-left-color: var(--accent2); }
.metric-card.amber  { border-left-color: var(--warn); }
.metric-card.red    { border-left-color: var(--danger); }
.metric-val {
    font-family: var(--mono);
    font-size: 18px;
    color: var(--text-bright);
    font-variant-numeric: tabular-nums;
}
.metric-label {
    font-family: var(--body);
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

/* ── Status bar ─────────────────────────────────────────────────────── */
.status-bar {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--text-dim);
    border-top: 1px solid var(--border);
    margin-top: 8px;
    padding-top: 6px;
}

/* ── Checkboxes / radio ─────────────────────────────────────────────── */
input[type="checkbox"], input[type="radio"] {
    accent-color: var(--accent) !important;
    width: 16px !important;
    height: 16px !important;
    appearance: auto !important;
    -webkit-appearance: auto !important;
    opacity: 1 !important;
    position: relative !important;
    pointer-events: auto !important;
}
input[type="checkbox"]:checked, input[type="radio"]:checked {
    background: var(--accent) !important;
    border-color: var(--accent) !important;
}
/* Force native rendering over Gradio's custom styling */
.checkbox-item input, label input[type="checkbox"], label input[type="radio"] {
    appearance: auto !important;
    -webkit-appearance: auto !important;
    opacity: 1 !important;
}
/* Selected item label highlight */
.checkbox-item.selected, label:has(input:checked) {
    border-color: var(--accent) !important;
    background: rgba(74, 158, 202, 0.15) !important;
    color: var(--text-bright) !important;
}

/* ── Status pills ───────────────────────────────────────────────────── */
.pill {
    display: inline-flex;
    font-family: var(--mono);
    font-size: 10px;
    border-radius: 20px;
    padding: 2px 10px;
    align-items: center;
}
.pill.nominal {
    background: rgba(79, 201, 138, 0.15);
    color: var(--accent2);
}
.pill.warn {
    background: rgba(212, 146, 42, 0.15);
    color: var(--warn);
}
.pill.danger {
    background: rgba(201, 74, 74, 0.15);
    color: var(--danger);
}
"""

# ── JS — force dark mode ───────────────────────────────────────────────────
FORCE_DARK = """
function FORCE_DARK() {
    document.body.classList.add('dark');
    document.documentElement.style.colorScheme = 'dark';

    /* Issue #13: ensure Plotly modebar (download/copy buttons) is visible */
    const observer = new MutationObserver(() => {
        document.querySelectorAll('.js-plotly-plot').forEach(plot => {
            if (plot._fullLayout && !plot._modebarPatched) {
                Plotly.relayout(plot, {'modebar.orientation': 'v'});
                plot._modebarPatched = true;
            }
        });
    });
    observer.observe(document.body, {childList: true, subtree: true});
}
"""

# ── Metric card helper ──────────────────────────────────────────────────────

def metric_html(label: str, value: str, unit: str = "", accent: str = "") -> str:
    """Render a single metric card div.

    Parameters
    ----------
    label : str
        Short uppercase label displayed beneath the value.
    value : str
        Primary numeric / text value.
    unit : str, optional
        Unit suffix appended after *value*.
    accent : str, optional
        Extra CSS class for the card, e.g. ``"green"``, ``"amber"``, ``"red"``.

    Returns
    -------
    str
        HTML string for one ``.metric-card``.
    """
    cls = f"metric-card {accent}" if accent else "metric-card"
    unit_span = f" <span style='font-size:12px;color:{TEXT_DIM}'>{unit}</span>" if unit else ""
    return (
        f'<div class="{cls}">'
        f'  <div class="metric-val">{value}{unit_span}</div>'
        f'  <div class="metric-label">{label}</div>'
        f"</div>"
    )


# ── Font family strings (for inline styles & Plotly) ───────────────────────

FONT_MONO = "JetBrains Mono, monospace"
FONT_BODY = "DM Sans, sans-serif"


def engine_banner(label: str, color: str = ACCENT) -> str:
    """Render a small engine-label banner for the left panel."""
    return (
        f'<div style="font-family:{FONT_MONO};font-size:11px;'
        f'color:{color};letter-spacing:3px;text-transform:uppercase;'
        f'padding:6px 0;border-bottom:1px solid {BORDER};margin-bottom:8px;">'
        f'{label}</div>'
    )


# ── Plotly template ─────────────────────────────────────────────────────────

_axis = dict(
    gridcolor="rgba(40,55,75,0.9)",
    linecolor=BORDER_BRIGHT,
    zeroline=False,
    tickfont=dict(family=FONT_MONO, size=10, color=TEXT_DIM),
)

_template = go.layout.Template(
    layout=go.Layout(
        paper_bgcolor=SURFACE,
        plot_bgcolor=SURFACE,
        font=dict(family=FONT_BODY, color=TEXT),
        title=dict(font=dict(family=FONT_BODY, color=TEXT_DIM)),
        xaxis=_axis,
        yaxis=_axis,
        colorway=TRACE_COLORS,
        margin=dict(l=56, r=16, t=44, b=44),
        modebar=dict(
            bgcolor="rgba(0,0,0,0)",
            color=TEXT_DIM,
            activecolor=ACCENT,
            orientation="v",
        ),
    )
)

# Plotly config applied to all figures — ensures modebar with download/copy
# button is visible (issue #13).
PLOTLY_CONFIG = {
    "displayModeBar": True,
    "modeBarButtonsToAdd": ["toImage"],
    "toImageButtonOptions": {
        "format": "png",
        "filename": "murphy_plot",
        "scale": 2,
    },
}

pio.templates["murphy"] = _template
pio.templates.default = "murphy"